This is mostly true, unless you plan to go explicitly into the sex scenes, kinks and smut of course. If you can write straight romances reasonably well you can probably write at least an okay gay romance.
Also how the world views their gender, masculinity, femininity using the culture(s) of the gameworld and weaving it into the romance and the characters themselves greatly enhances the verisimilitude of the game world, which also enhances the romance.
For example one of Bioware’s chief flaws is that they design all these fantasy and sci-fi worlds and then have the characters in them have the moral standards and make them behave as if they were transplanted contemporary Canadians, which detracts from the verisimilitude and all that world-building efforts and is one of my main gripes with Bioware’s style of world-building.
Yep, this is the one concession I’d like that may deviate from my previous point in most of my escapism. Unless you really want to tell a very particular story that absolutely requires it and know what you’re doing.
Specifically the gay mc you mean. This can be aggravating particularly with bisexual ro’s because of what it implies. Nonetheless there are gay guys who do enjoy those things and we shouldn’t slip into the reverse and condemn that, just avoid the trap of assuming it is the default setting of all gay guys. Ideally allow the mc and their ro to work it out sort of like real people would if you do go there and want to have or mention sex-scenes.
Indeed!
Yes, you can be lots of (confusing) things and I’ve met at least one homoromantic bisexual guy, for example. Homoromantic asexual also definitely happens, as back during my worst years when I pretty much didn’t have a libido to speak of due to the Celiac’s I used to believe I was this. On the other hand my XoR mc would probably veer into homosexual but (mostly) aromantic territory.
There’s a whole spectrum of of orientations and preferences beyond the vanilla, or as Mara called it “Victorian” and heterosexual “default” of our (popular) culture.
We can show what is basically straight porn in some 17+ videogames these days, but two guys kissing or even holding hands in public, whoa that’s radical! 
Or at least that is the unfortunate attitude of much of the mainstream media and nearly all AAA videogame developers.
I’d say it’s still baby steps over here our mainstream TV has moved from gay male characters basically displaying no affection when they’re not in private to holding hands and hugging on occasion. But even kissing is still very rare and the most common male/male sex scene is still the rare (shirtless) kiss followed by the fade to black whereas most straight sex scenes fall at minimum under the category of carefully edited nude shots with weird camera angles if they’re not basically porn. Just to clarify I’m talking about entertainment targeted mainly at adults here, instead of all ages or youth of course.
Mainland China is going from bad to worse these days.
While I watch it less these days I do remember that with the subtext and even the occasional kiss Hong Kong used to be light years in advance of us poor Western Europeans during the 90’s and early 00’s and Japanese cinema has never shied away from the the copious amounts of double entendre and sexual subtext in some of its male and male relationships and overall they tended to have much more varieties of male characters and relationships and their male actors used to emote better and far more often then ours.
Or a porn director yourself. Who knows you might break new ground there and pioneer a whole new cinema/video genre. 
This actually seems to be very common with most of the women I tend to talk with even the heterosexual ones but does seem to be mostly absent or less pronounced in straight guys.
Of course one of my theories is that it really isn’t in most of them but they repress talking about it and bottle it up and internalize in less healthy ways, as internet trolls for example.
But please do take the anatomical differences into account and don’t put gay players in a poorly converted and edited female role and don’t call us “queens” unless the character/mc in question really is one, drag or otherwise and they have indicated they don’t mind being called this in casual conversation.
Protip: Most drag queens are in fact straight, not gay, guys.
